High performance 14 cm fan with S-FLOW blades supplying 30% more airflow than a standard fan at the same speed. Supporting fully automatic PWM speed control, the VIPER-R uses custom design PWM IC that integrates Soft Switching Commutation (SSC) technology, provides smooth silent operation.The Viper fan creates more focused airflow providing blind-spot cooling, which makes it an ideal solution for a case or heatsink fan. HDB (Hydro Dynamic) bearings extend fan life and further enhance noise reduction.